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If SRN voltage is greater than AVCC, the charger enters low quiescent current SLEEP mode to minimize current drain from the battery. During SLEEP mode, the VREF output turns off and the STAT pin goes to high impedance.
ACOV provides protection to prevent system damage due to high input voltage. In bq24170/172, once the voltage on OVPSET is above the 1.6V ACOV threshold or below the 0.5V ACUV threshold, charge is disabled and input MOSFETs turn off. The bq24170/172 provides flexibility to set the input qualification threshold.
